package org.myname.example2;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class UsernameList
 */
@WebServlet("/UsernameList")
public class UsernameList extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public UsernameList() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		List<String> usernames = (List<String>)request.getServletContext().getAttribute("usernameList");
		
		if(usernames==null){
			usernames=new ArrayList<String>();
		}

		String name = (String) request.getSession().getAttribute("username");
		String line ="me:" + name + ",";
		
		for(String username:usernames){
			line += username+",";
		}
		line=line.equals("")?line:line.substring(0, line.length()-1);
		response.getWriter().println(line);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}
